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Nutrient Management & Soil & Plant Analysis

Linking Manure Properties to Phosphorus Solubility in Calcareous Soils

Importance of the Manure Carbon to Phosphorus Ratio

^a USDA-ARS, Northwest Irrigation and Soils Research Lab., 3793N 3600E, Kimberly, ID 83341
^b Smithsonian Tropical Research Institute, Apartado 0843-03092, Balboa, Ancón, Panama, Republica de Panama
^c USDA-ARS, Small Grains and Potato Germplasm Research Unit, Aberdeen, ID 83210

^* Corresponding author (leytem{at}nwisrl.ars.usda.gov)

Land application of manure can increase P transfer in runoff, although the risk depends in part on the characteristics of the manure. We assessed this for calcareous soils using manures from swine (Sus domesticus) fed one of five barley varieties (Hordeum vulgare L.), including four low phytate mutants and a normal variety, to produce manures with a range of total P (6.8–4.9 g P kg^–1), water-soluble P (4.3–8.0 g P kg^–1), total N/P ratios (2.5:1–5.5:1), and total C/P ratios (31:1–67:1). Two experiments were conducted. First, manures were incorporated into three soils on a N (150 mg N kg^–1 soil) or P (27.5 mg P kg^–1 soil) basis three times during a 7-wk incubation. Second, 10 additional soils were incubated for 2 wk following a single P-based manure application (82.5 mg P kg^–1 soil). Water and NaHCO₃ (Olsen) extractable P were determined at regular intervals, with microbial P determined by fumigation–extraction after each incubation. For N-based application (i.e., variable P amendment), extractable P increased with total P applied. For P-based applications, the increase in soil P was more closely correlated to microbial P concentration than manure P composition or soil properties. These results suggest that stimulation of the microbial biomass by added organic C is important in determining soil P solubility following manure application.

Abbreviations: WSP, water-soluble P

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				A. B. Leytem, D. R. Smith, T. J. Applegate, and P. A. Thacker The Influence of Manure Phytic Acid on Phosphorus Solubility in Calcareous Soils Soil Sci. Soc. Am. J., August 3, 2006; 70(5): 1629 - 1638. [Abstract] [Full Text] [PDF]